Ionic Compounds: SULPHATE AND SULPHITE IONS ( So4 2- & So3 2-)

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Interference

1. •Ba2* + SO4 2- = BaSO4 •Ba2* + SO3 2- = BaSO3 2. •BaSO4 + HCl = No reaction •BaSO3 + 2HCl= BaCl2+SO2+H2O

Observation

White precipitate (both) Sulphate- precipitate remains Sulphite- precipitate disappears

Test

•Add barium chloride (BaCl2) •Add HCl (to distinguish)


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